AMD EPYC 7543 vs AMD Ryzen 3 7440U Comparison

The AMD Ryzen 3 7440U and AMD EPYC 7543 occupy opposite ends of the computing spectrum, yet both share a 69th percentile ranking among all CPUs. The 7440U is a 4-core mobile processor built on Zen 4, while the 7543 is a 32-core server beast on Zen 3. Benchmark data reveals a predictable but absolute dominance by the EPYC part, though the Ryzen’s architectural advantages hint at strengths the raw scores do not fully capture.

Head-to-Head Benchmarks

The head-to-head comparison is a clean sweep: the AMD EPYC 7543 wins all six Cinebench tests, with the Ryzen 3 7440U trailing by roughly 79.4% in every single metric. The multicore results are the most dramatic. In Cinebench R23 multicore, the EPYC 7543 scores 53,509 against the 7440U’s 11,042 — a 79.4% deficit for the mobile chip. This gap stems directly from core count: the EPYC’s 32 cores and 64 threads overwhelm the 7440U’s 4 cores and 8 threads in heavily parallel workloads. The Cinebench R20 multicore test shows a similar story, with the EPYC posting 22,473 versus 4,637 for the Ryzen, again a 79.4% gap.

What is more surprising is that the single-core tests tell the same story. In Cinebench R23 single-core, the EPYC 7543 scores 7,554, while the 7440U manages only 1,558 — a 79.4% difference. This is remarkable because the Ryzen 3 7440U has a higher boost clock (4.70 GHz versus 3.70 GHz) and a newer architecture (Zen 4 versus Zen 3). The data suggests that the EPYC’s larger L3 cache (256 MB shared versus 8 MB shared) and higher TDP (225W versus 28W) allow it to sustain higher per-core performance despite the lower clock speed. The Cinebench R15 single-core result reinforces this: 761 for the EPYC versus 156 for the Ryzen, a 79.5% delta — the largest margin in any test.

The multicore deltas are consistent at 79.4% across R15, R20, and R23, indicating that the performance ratio is stable regardless of the Cinebench version. This uniformity suggests a fixed architectural advantage rather than a workload-specific quirk. The EPYC’s eight-channel DDR4 memory bus (204.8 GB/s) versus the 7440U’s dual-channel DDR5 (89.6 GB/s) likely contributes to the sustained lead, as memory bandwidth becomes a bottleneck in multi-core rendering tasks. The Ryzen 3 7440U’s nearest rivals (Intel Core i5-11400H at -0.4% and AMD EPYC 9254 at -0.5%) show that its average score of 15,682 is competitive within its own class, but the EPYC 7543’s average of 15,477 places it slightly below the 7440U in overall average — a quirk of the benchmark pool, since the head-to-head tests are exclusively Cinebench, where the EPYC dominates.

FAQ

Q: Why does the AMD EPYC 7543 win every head-to-head benchmark despite having a lower boost clock?

A: The EPYC 7543 has 32 cores and 64 threads versus the 7440U’s 4 cores and 8 threads. Even at a 3.70 GHz boost versus 4.70 GHz, the EPYC’s sheer core count and 256 MB of shared L3 cache (versus 8 MB) deliver superior throughput. The data shows a consistent 79.4% lead across all Cinebench tests.

Q: Is the Ryzen 3 7440U competitive in any benchmark category?

A: The head-to-head data shows zero wins for the 7440U. However, its average benchmark score of 15,682 is slightly higher than the EPYC’s 15,477, driven by non-Cinebench tests like Geekbench (multi-core 5,806) and PassMark (multi-thread 12,991). These tests are not included in the head-to-head comparison.

Q: What explains the 79.4% delta in single-core tests?

A: Single-core Cinebench scores show the EPYC at 7,554 versus 1,558 (R23). Despite the 7440U’s newer Zen 4 architecture and higher boost clock, the EPYC’s 225W TDP and 256 MB L3 cache allow it to sustain higher per-core performance. The 79.4% delta is nearly identical to the multicore gap, indicating the EPYC’s per-core efficiency is proportionally higher.

Q: How do the memory systems differ, and does it matter?

A: The EPYC 7543 uses eight-channel DDR4 with 204.8 GB/s bandwidth, while the 7440U uses dual-channel DDR5 with 89.6 GB/s. The EPYC’s memory bandwidth is 2.3 times higher, which is critical for multi-core workloads that saturate memory buses. Both support ECC memory.

Q: Are there any scenarios where the Ryzen 3 7440U would be preferable based on the data?

A: The 7440U has an integrated Radeon 740M GPU, while the EPYC has none. For systems requiring a discrete GPU, the EPYC’s 128 PCIe Gen 4 lanes (versus 14 for the 7440U) provide far more expansion. The 7440U’s lower TDP (28W versus 225W) makes it suitable for mobile or low-power environments, though the benchmark data does not favor it in raw performance.

Q: What is the launch MSRP of the EPYC 7543?

A: The launch MSRP is $3761. The 7440U has no listed launch MSRP in the data.

The Verdict

The data is unambiguous: the AMD EPYC 7543 is the superior processor for raw compute performance. It wins 100% of the head-to-head tests, with a consistent 79.4% margin across all Cinebench versions. For any workload that stresses multi-core rendering, simulation, or data processing, the EPYC’s 32 cores and 64 threads deliver results the 4-core 7440U cannot approach. The EPYC’s 225W TDP and 256 MB L3 cache are the enabling factors, and its 128 PCIe Gen 4 lanes make it a server-class platform.

The Ryzen 3 7440U, however, is not without merit. Its 28W TDP and integrated Radeon 740M GPU make it a compelling option for compact, power-efficient systems. Its average benchmark score of 15,682 is actually higher than the EPYC’s 15,477, suggesting that in a broader test suite (including PassMark integer math at 36,758 and floating point at 20,291), the 7440U holds its own in single-threaded and mixed workloads. The 7440U’s Zen 4 architecture and 4 nm process node (versus 7 nm for the EPYC) represent a newer design, though the EPYC’s larger cache and memory bandwidth compensate in heavy compute.

For a server or workstation where multi-core throughput is paramount, the EPYC 7543 is the clear choice. For a mobile or low-power system where energy efficiency and integrated graphics matter more than raw Cinebench scores, the 7440U is the only option with the data to support its use. The 69th percentile ranking for both chips indicates they are mid-tier performers in their respective segments, but the EPYC’s head-to-head sweep makes it the definitive winner in this comparison.

Specification Differences

The two processors differ in nearly every fundamental specification. The 7440U has 4 cores and 8 threads, while the EPYC 7543 has 32 cores and 64 threads. Base clocks are close (3.00 GHz versus 2.80 GHz), but boost clocks diverge: 4.70 GHz for the 7440U versus 3.70 GHz for the EPYC. TDP is a stark contrast: 28W for the mobile chip versus 225W for the server chip. Sockets differ (AMD Socket FP7 versus AMD Socket SP3). Process nodes differ: 4 nm (TSMC) versus 7 nm (TSMC). Transistor counts are 20,900 million versus 33,200 million. Die size is 137 mm² versus 8x 81 mm². L1 cache is identical (64 KB per core), but L2 differs: 1 MB per core for the 7440U versus 512 KB per core for the EPYC. L3 cache is 8 MB shared versus 256 MB shared. Memory support differs: DDR5 dual-channel versus DDR4 eight-channel. Memory bandwidth is 89.6 GB/s versus 204.8 GB/s. PCIe lanes are 14 versus 128 (both Gen 4). The 7440U has integrated Radeon 740M graphics; the EPYC has none. Release dates differ: 2023-05-02 for the 7440U versus 2021-03-14 for the EPYC. The EPYC has a launch MSRP of $3761; the 7440U has none.

Architecture Differences

The Ryzen 3 7440U is built on Zen 4 architecture (codename Phoenix2) using a 4 nm process at TSMC, with 20,900 million transistors on a 137 mm² die. The EPYC 7543 uses Zen 3 architecture (codename Milan) on a 7 nm process, with 33,200 million transistors spread across 8x 81 mm² dies. The 7440U’s L2 cache is 1 MB per core, double the EPYC’s 512 KB per core, but the EPYC’s L3 cache is 256 MB shared — 32 times larger than the 7440U’s 8 MB. The 7440U supports DDR5 memory, while the EPYC supports DDR4. The EPYC’s eight-channel memory bus (204.8 GB/s) is a server-class feature absent from the dual-channel 7440U. Both support ECC memory. The 7440U has 14 PCIe Gen 4 lanes; the EPYC has 128. The 7440U includes a Radeon 740M integrated GPU, a feature the EPYC lacks entirely. The 7440U’s generation is listed as "Ryzen 3 (Zen 4 (Phoenix))" while the EPYC is "EPYC (Zen 3 (Milan))". The 7440U’s process node advantage (4 nm versus 7 nm) suggests higher transistor density, but the EPYC’s larger cache and memory bandwidth dominate in multi-core workloads.

Where Each One Wins

The AMD EPYC 7543 wins in every Cinebench test — R15, R20, and R23, both single and multi-core. Its 32 cores and 64 threads make it the definitive choice for multi-threaded rendering, scientific computing, and any workload that scales with core count. The 256 MB L3 cache and 204.8 GB/s memory bandwidth provide the data throughput necessary for server-class applications. The 128 PCIe Gen 4 lanes allow for massive I/O expansion, and the eight-channel DDR4 memory support enables high-capacity configurations. The 225W TDP indicates sustained performance under load, making it suitable for rack-mounted servers or workstations where power is not a constraint.

The Ryzen 3 7440U wins no head-to-head benchmarks, but its strengths lie elsewhere. The integrated Radeon 740M GPU provides graphics capability without a discrete card, making it suitable for compact desktops or all-in-one systems. The 28W TDP enables fanless or low-power cooling solutions, and the 4 nm process node (versus 7 nm) suggests better energy efficiency per transistor. The 7440U’s higher boost clock (4.70 GHz) and dual-channel DDR5 support (89.6 GB/s) are modern features, though the data shows they do not translate to Cinebench wins. Its average benchmark score of 15,682 slightly exceeds the EPYC’s 15,477, driven by PassMark results like integer math (36,758) and floating point (20,291), which are not part of the head-to-head suite. The 7440U is the better choice for mobile computing, embedded systems, or any scenario where power draw and physical footprint are the primary constraints. The EPYC 7543 is the better choice for raw compute density, and the data supports this with a 79.4% margin across all six Cinebench tests.